<template>
  <div class="cart">
    <h4>全部商品</h4>
    <div class="cart-main">
      <div class="cart-th">
        <div class="cart-th1">全部</div>
        <div class="cart-th2">商品</div>
        <div class="cart-th3">单价（元）</div>
        <div class="cart-th4">数量</div>
        <div class="cart-th5">小计（元）</div>
        <div class="cart-th6">操作</div>
      </div>
      <div class="cart-body">
        <ul class="cart-list" v-for="(cartInfo,index) in cartInfoList" :key="cartInfo.id">
          <li class="cart-list-con1">
            <input type="checkbox" :checked="cartInfo.isChecked" name="chk_list" 
            @click="handleChecked(cartInfo.skuId,cartInfo.isChecked)">
          </li>
          <li class="cart-list-con2">
            <img :src="cartInfo.imgUrl">
            <div class="item-msg">{{cartInfo.skuName}}</div>
          </li>
          <li class="cart-list-con4">
            <span class="price">{{cartInfo.skuPrice}}.00</span>
          </li>
          <li class="cart-list-con5">
            <a class="mins" @click="changeSkuNum('minus',cartInfo)">-</a>
            <input ref="skuNumInput" autocomplete="off" @change="changeSkuNum('change',cartInfo,$event,index)" type="text" :value="cartInfo.skuNum" minnum="1" class="itxt">
            <a class="plus" @click="changeSkuNum('add',cartInfo)">+</a>
          </li>
          <li class="cart-list-con6">
            <span class="sum">{{cartInfo.skuNum*cartInfo.skuPrice}}</span>
          </li>
          <li class="cart-list-con7">
            <a  class="sindelet" @click="handleDelete(cartInfo.skuId)">删除</a>
            <br>
          </li>
        </ul>
      </div>
    </div>
    <div class="cart-tool" v-show="cartInfoList.length > 0">
      <div class="select-all">
        <input class="chooseAll" :checked="isAll" type="checkbox" @click="handleCheckAll">
        <span >全选</span>
      </div>
      <div class="option">
        <a @click="batchDelete">删除选中的商品</a>
        <!-- <a href="#none">移到我的关注</a>
        <a href="#none">清除下柜商品</a> -->
      </div>
      <div class="money-box">
        <div class="chosed">已选择
          <span>{{totalSkuNum}}</span>件商品</div>
        <div class="sumprice">
          <em>总价（不含运费） ：</em>
          <i class="summoney">{{sumPrice}}</i>
        </div>
        <div class="sumbtn">
          <router-link class="sum-btn" to="trade" >结算</router-link>
        </div>
      </div>
    </div>
    <div v-show="!cartInfoList.length" style="text-align:center;font-size:20px;margin-bottom:20px">购物车还没有商品，快去添加商品吧</div></div></div>
  </div>
</template>

<script>
import throttle from 'lodash/throttle'
import {mapGetters} from 'vuex'
import {reqDeleteSkuInCart,reqCheckSkuInCart, reqCheckAll,reqAddOrUpdate,reqBatchDeleteCart} from '@/api'
import {Message} from 'element-ui'
import {skuNumReg} from '@/utils/reg'
  export default {
    name: 'Cart',
    // data() {
    //   return {
        
    //   }
    // },
    mounted() {
      this.$store.dispatch('cart/getCartList')
    },
    computed:{
      ...mapGetters('cart',['cartInfoList']),
      //总商品数量
      totalSkuNum(){
        return this.cartInfoList.reduce((pre,current)=>{
           return pre+(current.isChecked ? current.skuNum : 0)
         },0)
      },
      //商品总额
      sumPrice(){
        return this.cartInfoList.reduce((pre,current)=>{
           return pre+(current.isChecked ? current.skuNum*current.skuPrice : 0)
         },0)
      },
      //是否全选
      isAll(){
        return this.cartInfoList.every(item=>item.isChecked===1)
      }
    },
    methods: {
      //封装函数，减少代码重复
      //请求刷新购物车商品信息
      refreshCart(result){
        if(result.code!==200) return Message.error(result.message)
        this.$store.dispatch('cart/getCartList')
      },
      //请求更改购物车商品数量
      async updateSkuNum(skuId,skuNum){
        const result =await reqAddOrUpdate(skuId,skuNum)
        return this.refreshCart(result)
      },
      //删除
      async handleDelete(skuId){
        const result =await reqDeleteSkuInCart(skuId)
        if(result.code===200){
          Message.success('删除成功')
          this.$store.dispatch('cart/getCartList')
        }else{
          Message.error(result.message)
        }
      },
      //点击商品复选框，切换选中状态
      async handleChecked(skuId,isChecked){
        isChecked =isChecked ? 0 : 1
        const result =await reqCheckSkuInCart(skuId,isChecked)
        this.refreshCart(result)
      },
      //全选
      async handleCheckAll(e){
        const isChecked=e.target.checked ? 1:0
        const skuIdList=this.cartInfoList.map(item => item.skuId)
        const result =await reqCheckAll(isChecked,skuIdList)
        this.refreshCart(result)
      },
      //+ -即输入改变商品数量
      // if(type==='minus'){
        //   const result =await reqAddOrUpdate(cartInfo.skuId,-1)
        //   if(result.code===200){
        //     this.$store.dispatch('cart/getCartList')
        //   }else{
        //     Message.error(result.message)
        //   }
        // }else if(type==='add'){
        //   const result =await reqAddOrUpdate(cartInfo.skuId,1)
        //   if(result.code===200){
        //     this.$store.dispatch('cart/getCartList')
        //   }else{
        //     Message.error(result.message)
        //   }
        // }
       changeSkuNum:throttle(function(type,cartInfo,e,index){
        
        switch (type) {
          case 'minus':
            if(cartInfo.skuNum-1<=0) return
            this.updateSkuNum(cartInfo.skuId,-1)
            break;
          case 'add':
            if(cartInfo.skuNum+1>200) return
            this.updateSkuNum(cartInfo.skuId,1)
            break;
          case 'change':
            const inputNum=e.target.value
            if(skuNumReg.test(inputNum)){
              this.updateSkuNum(cartInfo.skuId,inputNum-cartInfo.skuNum)
              
            }else{
              if(inputNum<0){
                this.$refs.skuNumInput[index].value=1
                this.updateSkuNum(cartInfo.skuId,1-cartInfo.skuNum)
              }else if(inputNum>200){
                this.$refs.skuNumInput[index].value=200
                this.updateSkuNum(cartInfo.skuId,200-cartInfo.skuNum)
              }
            }
            break;
        }
      },700,{trailing:false}),
      //批量删除选中商品
      async batchDelete(){
        const skuIdList=[]
        this.cartInfoList.map(item=>{
         if(item.isChecked) skuIdList.push(item.skuId)
        })
        const result =await reqBatchDeleteCart(skuIdList)
        this.refreshCart(result)
      }
    },
  }

</script>

<style lang="less" scoped>
.cart {
  a{
    cursor: pointer;
  }
  width: 1200px;
  margin: 0 auto;
  h4 {
    margin: 9px 0;
    font-size: 14px;
    line-height: 21px;
  }
  .cart-main {
    .cart-th {
      background: #f5f5f5;
      border: 1px solid #ddd;
      padding: 10px;
      overflow: hidden;
      & > div {
        float: left;
      }
      .cart-th1 {
        width: 25%;
        input {
          vertical-align: middle;
        }
        span {
          vertical-align: middle;
        }
      }
      .cart-th2 {
        width: 25%;
      }
      .cart-th3,
      .cart-th4,
      .cart-th5,
      .cart-th6 {
        width: 12.5%;
      }
    }
    .cart-body {
      margin: 15px 0;
      border: 1px solid #ddd;
      .cart-list {
        padding: 10px;
        border-bottom: 1px solid #ddd;
        overflow: hidden;
        & > li {
          float: left;
        }
        .cart-list-con1 {
          width: 15%;
        }
        .cart-list-con2 {
          width: 35%;
          img {
            width: 82px;
            height: 82px;
            float: left;
          }
          .item-msg {
            float: left;
            width: 150px;
            margin: 0 10px;
            line-height: 18px;
          }
        }
        .cart-list-con4 {
          width: 10%;
        }
        .cart-list-con5 {
          width: 17%;
          .mins {
            border: 1px solid #ddd;
            border-right: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }
          input {
            border: 1px solid #ddd;
            width: 40px;
            height: 33px;
            float: left;
            text-align: center;
            font-size: 14px;
          }

          .plus {
            border: 1px solid #ddd;
            border-left: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }
        }

        .cart-list-con6 {
          width: 10%;

          .sum {
            font-size: 16px;
          }
        }

        .cart-list-con7 {
          width: 13%;

          a {
            color: #666;
          }
        }
      }
    }
  }
  .cart-tool {
    overflow: hidden;
    border: 1px solid #ddd;

    .select-all {
      padding: 10px;
      overflow: hidden;
      float: left;

      span {
        vertical-align: middle;
      }

      input {
        vertical-align: middle;
      }
    }

    .option {
      padding: 10px;
      overflow: hidden;
      float: left;

      a {
        float: left;
        padding: 0 10px;
        color: #666;
      }
    }

    .money-box {
      float: right;

      .chosed {
        line-height: 26px;
        float: left;
        padding: 0 10px;
      }

      .sumprice {
        width: 200px;
        line-height: 22px;
        float: left;
        padding: 0 10px;

        .summoney {
          color: #c81623;
          font-size: 16px;
        }
      }
			

      .sumbtn {
        float: right;

        a {
          display: block;
          position: relative;
          width: 96px;
          height: 52px;
          line-height: 52px;
          color: #fff;
          text-align: center;
          font-size: 18px;
          font-family: "Microsoft YaHei";
          background: #e1251b;
          overflow: hidden;
        }
      }
    }
  }
}
</style>